Near the end of a press conference in Istanbul earlier this week, Orlando talked about future work and he mentioned that Legolas will appear in both remaining films and that he will be returning to New Zealand for more filming.

Here is the Youtube link, w/ the mentions starting at the 5 minute mark.

Just guessing the extra filming will be for his role in the Battle of the Five Armies "'Ai! ai!' wailed Legolas. 'A Balrog! A Balrog is come!' Gimli stared with wide eyes. 'Durin's Bane!' he cried, and letting his axe fall he covered his face. 'A Balrog,' muttered Gandalf. 'Now I understand. What an evil fortune! And I am already weary.''

I think that when they made the decision to go to 3 films,
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sometime early last year (or maybe even earlier), they moved all the BoFA filming to this year, and concentrated the rest that shooting block to filming the extra stuff they wrote for AUJ (i think Azog came out of this, ugh). I don't think anyone's said that officially, but it's what i've pieced together thus far. And i'd guess they're doing a lot of other (non-BoFA) pick-ups as well, and probably *another* round of pick-ups next year